Siemens SINUMERIK 840Di Manual page 428

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13 Drive Optimization using HMI Advanced

13.4 Frequency response measurement

Fig. 13-4 Example: Measurement results of a reference frequency response measurement

This parameter determines the height of the test signal amplitude. It should be

set to the smallest possible value (e.g. 0.01mm).

The bandwidth parameter is used to set the analyzed frequency range. The

larger this value, the finer the frequency resolution and the longer the measure-

ment time. The maximum value is given by the position control cycle (T

[ Hz ] = 1 / (2 * T

Example: Position controller cycle: 2msec

= 1 / (2 * 2*10

The accuracy of the measurement, but the measurement duration, too, will in-

crease with this value. A value of 20 is normally suitable.

Settling time

This value represents the delay between recording of the measured data and

injection of the test setpoint and offset. A value of between 0.2 and 1sec is rec-

ommended. Do not set too low a value for the settling times or the frequency

response and phase diagrams will be distorted.

position controller

SINUMERIK 840Di Manual (HBI) – 06.03 Edition